Vulnerabilities / Threats
8/11/2010
10:26 AM
50%
50%

Touchscreen Smudges Pose Security Risk

Residual fingerprint oils on smartphones, ATMs, and other devices may reveal passwords and other confidential data, find security researchers.




Slideshow: Cloud Security Pros And Cons
(click for larger image and for full photo gallery)
Prepare for a new mobile security threat: smudges. Or to be more precise, the oily residue left behind by fingers on your iPhone, Android, BlackBerry, or other touchscreen mobile device may help an attacker deduce your password.

That's the message from researchers at the University of Pennsylvania, who presented a paper at this week's Usenix conference analyzing "Smudge Attacks on Smartphone Touch Screens."

Based on their results, "the practice of entering sensitive information via touchscreens needs careful analysis," said the researchers. "The Android password pattern, in particular, should be strengthened." But they cautioned that any touchscreen device, including ATMs, voting machines, and PIN entry devices in retail stores, could be susceptible to smudge attacks.

Touchscreens, of course, are an increasingly common feature of mobile computing devices. According to Gartner Group, 363 million touchscreen mobile devices will be sold in 2010, an increase of 97% over last year's sales. But are passwords entered via touchscreens secure?

To find out, the researchers studied two different Android smartphones, the HTC G1 and the HTC Nexus1, evaluating different photography techniques for discerning a smudge pattern. With the best setup, they saw a complete smudge pattern two-thirds of the time, and could partially identify one 96% of the time. Furthermore, in ideal conditions -- say, if an attacker had physical possession of the device -- the researchers could oftentimes see finger-stroke directionality too, meaning that "the order of the strokes can be learned, and consequently, the precise patterns can be determined," they said.

While Android 2.2 adds an option for alphanumeric passwords, the team tested the numbers-only password protocol, which uses a virtual nine-digit keypad and imposes certain restrictions on repeat "contact points," as well as swipe patterns. The researchers note that numeric passwords are likely to remain the norm, especially for power users who must continuously "swipe in" to their device.

Given the contact point restrictions, the researchers found that "the password space of the Android password pattern contains 389,112 possible patterns." But an attacker will face a lockout -- typically, 30 seconds in duration -- after inputting an incorrect password. That would make manually entering too many passwords laborious. But by comparing smudge patterns with a dictionary of common patterns, an attacker might significantly reduce the password space. Thankfully, there's a failsafe on Android phones, since after 20 failed password attempts, a user must enter his or her Google username and password to authenticate.

The good news is that for now, even with a smudge attack, an attacker typically wouldn't be able to reduce the password space to 20 or fewer possibilities. But going forward, don't rule out the possibility that enterprising attackers may add on additional techniques to help see through smudges.

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Register for Dark Reading Newsletters
Dark Reading Live EVENTS
INsecurity - For the Defenders of Enterprise Security
A Dark Reading Conference
While red team conferences focus primarily on new vulnerabilities and security researchers, INsecurity puts security execution, protection, and operations center stage. The primary speakers will be CISOs and leaders in security defense; the blue team will be the focus.
White Papers
Video
Cartoon Contest
Write a Caption, Win a Starbucks Card! Click Here
Latest Comment: No, no, no! Have a Unix CRON do the pop-up reminders!
Current Issue
Security Vulnerabilities: The Next Wave
Just when you thought it was safe, researchers have unveiled a new round of IT security flaws. Is your enterprise ready?
Flash Poll
[Strategic Security Report] How Enterprises Are Attacking the IT Security Problem
[Strategic Security Report] How Enterprises Are Attacking the IT Security Problem
Enterprises are spending more of their IT budgets on cybersecurity technology. How do your organization's security plans and strategies compare to what others are doing? Here's an in-depth look.
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2017-0290
Published: 2017-05-09
NScript in mpengine in Microsoft Malware Protection Engine with Engine Version before 1.1.13704.0, as used in Windows Defender and other products, allows remote attackers to execute arbitrary code or cause a denial of service (type confusion and application crash) via crafted JavaScript code within ...

CVE-2016-10369
Published: 2017-05-08
unixsocket.c in lxterminal through 0.3.0 insecurely uses /tmp for a socket file, allowing a local user to cause a denial of service (preventing terminal launch), or possibly have other impact (bypassing terminal access control).

CVE-2016-8202
Published: 2017-05-08
A privilege escalation vulnerability in Brocade Fibre Channel SAN products running Brocade Fabric OS (FOS) releases earlier than v7.4.1d and v8.0.1b could allow an authenticated attacker to elevate the privileges of user accounts accessing the system via command line interface. With affected version...

CVE-2016-8209
Published: 2017-05-08
Improper checks for unusual or exceptional conditions in Brocade NetIron 05.8.00 and later releases up to and including 06.1.00, when the Management Module is continuously scanned on port 22, may allow attackers to cause a denial of service (crash and reload) of the management module.

CVE-2017-0890
Published: 2017-05-08
Nextcloud Server before 11.0.3 is vulnerable to an inadequate escaping leading to a XSS vulnerability in the search module. To be exploitable a user has to write or paste malicious content into the search dialogue.